Pressure gauge



A. E. CUTLER.

PRESSURE GAUGE.

APPLICATION man ocr1 12, 191s.

' 2,416,794. 2mm May 22, 2922.

unirse srares CHUSETTS.

PRESSUXLE GAUGE.

Application filed October l2, 1916.

To all whom 'it may @0f/acera.'

Be it known that l. Antenne E. Gurnnu. of Somerville, in theI county ot Middlesex' and State of Massachusetts, have invented a new and useful Pressure Gauge, oi which the following is a specifica-tion. i

The. main object of my invention is to provide a pressure gauge which will be satte and which will not cause injury to persons in the vicinity ot the gauge which injury has heretoit'oro resulted from explosions, whether such explosions are caused by bursting ot the pressure sensitive clement or otherwise. Such explosions have frequently.' occured in gauges used in connection with oxygen apparatus when oil has been permitted to enter the apparatus.

Another` object is to construct 'the device more cheaply and more durably than here toter Other objects will be pointed out below.

A teature ol my invention consists in providing a pressure outlet at the side ol the gauge so that the explosion will exert its force sidewise and preferably upwardly or downwardly and so that any parts of the structure which may be loosened by the explosion will fly sidewise and preferably upwardly or downwardly so that any person in :front of, or to the rear of, the gauge will be safe.

Another feature consists in making the attaching nipple integral with the casing which lessens the cost of manufacture very materially. One reason why this could not be done in the prior art is 'tha't with immovable side walls it was impossible to make a good joint for the Bourdon tube by soldering or the like particularly adjacent to the solid wall unless the nipple were separate from the casing.

Another feature is that I avoid a great deal of machine work heretofore necessary. My enclosing members are simply stamped out.

Another feature is that the attaching means tor the back act as portions of the hinge for the movable side member.

Another feature is a curved movable side member which not only guides any Flying parts but retards them.

i Still another feature is that the movable side member or members may open up but will not fly olf.

specificati on of Letters Patent.

Fatented; May 23, i922.

Serial No. 125,238.

lnthe drawings:

Figure l is a sectional elevation of' a gauge embodying my invention;

Figure 2 is an elevation partly in sec-tion on line Q-Q oit Figure l.; and

Figure 3 is a perspective otl one of the movable members.

The wall A has an integral lug a interiorly threaded and an integral flange a, the latter having two integral threaded bosses o2 (only one being shown) and two integral bosses e3 (only one being shown). The flange u. has integral nipple at to hold the device in place. The wall A is threaded to engage cap B carrying glass plate 5. Indicating plate D is held to wall A in any suitable way. indicating hand E is connected by any suitable mechanism such as F. to the Bourdon tube G which is soldered to boss g, the latter being integral with wall A..

the rear plate l-l is held in position by three screws, one of which being screw iz engaging lug (t and the others being screws L and .7b2 passing through bosses a3 and engaging bosses Pivoted on screws 7L and ft2 are members K and K each made oit sheet metal and having an integral bearing por` tion la which not only hinges its member but enters between bosses a2 and a3 to prevent sidewise movement, these memebrs K and K forming substantially all of the sides of the gauge. Suitably connected to members K and K are hooks 132 and 7a3 connected by a spring M which normally holds members K and K closed. It the spring should become disengaged the members K and K would not fly oli" because they are retained by screws 7L and 7b2.

lhile I have shown a single Bourdon tube I might use a double tube Bourdon spring or other pressure-sensitive means.

In case of any explosion the members K and K will move outwardly against the action of spring M and the force of the eXplosion as well as any parts that might become free will be guided upwardly at the side of the gauge and will also be retarded by the curvedr'orn'i ot said members.

lNhat claim is:

l. A pressure gauge casing having a front wall; a rear wall and two members movable relatively to each other to provide an outlet intermediate of said walls while the latter are in their normal position, and a spring eonneoting seid members to holijl them norinally oloseiil.

2. A pressure gauge casing having :i Vtrent Avail; e rear Well; a member cooperating in the holding ol saifl Walls together; unil zi pivotetl sifle member, suiil cooperating ineinbei serviiip` :is the pivot ot said side member;

3. A, pressure gauge casing having' a listed trout Wall; a tired rear plate; two members 'forming the intermediate sitles et the easing' and being pivoteil to the ixerl part oli' the casing: :incl :i springnormsilliv holding' seid members in their closed position.

4f. A pressure gauge casing haring s. lxetl front Well; u lined rear Wall; an attaching nipple integral with one ot said Walls; two members forming the intermeiiliate sides oit the casing and being pivoted to the iizecl part of the casing; and a spring normally holding` said members in their closed position.

5. A pressure gauge casing' haii/'ing zi. :trent wall; a. rear Wall; two members movable to form an outlet in ease ot excess pressure und being intermediate of said Walls :nifl torming a` portion of said casing; and resilient means for holding seid members in their closed position.

6. A pressure gauge easing hm'ing. u 'front Wall 5 a, rear Well a. member intermediate of said Wells and zittaehetlto one ot' them but nioif'eble to provide automatically un outlet 'toi' excess pressure; sind means between the Wells to hold said member normally7 eloserl.

7. A pressure gauge comprising u [ixed body consisting o't a trout Wall, a rear 'Wall spaced 'from the front wall7 and u, fixed ooniieotioii between seid Walls; und two intermediate members each normally extending from one ot' suiel Walls to the other to vtorni with seid Walls s chamber, said members being pivotzilly attached to said bodyv but `iiclaptetl to swing outwaixll;7 under the force ot' excess pressure to provide a complete outlet for such explosion; and a spring connecting said intermediate members to normailly hold them closed but permit-ting outward movement When the enplosion occurs.

ARTHUR E. CUTLER 

